I can't speak for the PSP, but this ABSOLUTELY does work on the DS! I used software called "DS LCD Tester" which sets the screens to all white and brightness on high, then I left it for about a month and most of the yellowing on my DSi XL screen is gone (at least noticeable to me).
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Re: This Simple Trick Could "Fix" Your Nintendo DS Or PSP's Yellowing Display
I can't speak for the PSP, but this ABSOLUTELY does work on the DS! I used software called "DS LCD Tester" which sets the screens to all white and brightness on high, then I left it for about a month and most of the yellowing on my DSi XL screen is gone (at least noticeable to me).